Question

我尝试在Android应用中使用Firebase数据库，但是当我运行应用时，我的输出是空白的。我不知道如何在我的应用中查看所有Firebase数据。

Firebase数据库

ProductionDetail.java

public class ProductionDetail extends AppCompatActivity {

RecyclerView mRecyclerview;
Myadapater adapter;
List<Datastore> listData;
FirebaseDatabase FDB;
DatabaseReference DBR;

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_production_detail);

    mRecyclerview = (RecyclerView)findViewById(R.id.recycle_view);

    mRecyclerview.setHasFixedSize(true);
    RecyclerView.LayoutManager LM = new 
LinearLayoutManager(getApplicationContext());
    mRecyclerview.setLayoutManager(LM);
    mRecyclerview.setItemAnimator(new DefaultItemAnimator());
    mRecyclerview.addItemDecoration(new 
DividerItemDecoration(getApplicationContext(), 
LinearLayoutManager.VERTICAL));

    listData = new ArrayList<>();

    adapter = new Myadapater(listData);

    FDB = FirebaseDatabase.getInstance();
    GetDataFirebase();



}

void GetDataFirebase(){

    DBR = FDB.getReference("Sreeauto");

    DBR.addChildEventListener(new ChildEventListener() {
        @Override
        public void onChildAdded(DataSnapshot dataSnapshot, String s) {

            Datastore data = new Datastore();
            data = dataSnapshot.getValue(Datastore.class);

            listData.add(data);

            mRecyclerview.setAdapter(adapter);
        }

        @Override
        public void onChildChanged(DataSnapshot dataSnapshot, String s) {

        }

        @Override
        public void onChildRemoved(DataSnapshot dataSnapshot) {

        }

        @Override
        public void onChildMoved(DataSnapshot dataSnapshot, String s) {

        }

        @Override
        public void onCancelled(DatabaseError databaseError) {

        }
    });
}

public class Myadapater extends 
RecyclerView.Adapter<Myadapater.MyViewHolder>{
    List<Datastore> listArray;

    public Myadapater(List<Datastore> List){
        this.listArray = List;
    }



    @Override
    public Myadapater.MyViewHolder onCreateViewHolder( ViewGroup parent, int 
viewType) {
        View view = 
LayoutInflater.from(parent.getContext()).inflate(R.layout.row, parent, 
false);

        return new MyViewHolder(view);
    }

    @Override
    public void onBindViewHolder( Myadapater.MyViewHolder holder, int 
position) {
        Datastore datastore = listArray.get(position);

        holder.txt_date.setText(datastore.getDate());
        holder.txt_shift.setText(datastore.getShift());
        holder.txt_incharge.setText(datastore.getIncharge());
        holder.txt_qty.setText(datastore.getQty());
    }

    public class MyViewHolder extends RecyclerView.ViewHolder {

        TextView txt_date;
        TextView txt_shift;
        TextView txt_incharge;
        TextView txt_qty;

        public MyViewHolder(View itemView) {
            super(itemView);

            TextView txtdate = 
(TextView)itemView.findViewById(R.id.txt_date);
            TextView txtshift = 
(TextView)itemView.findViewById(R.id.txt_shift);
            TextView txtincharge = 
(TextView)itemView.findViewById(R.id.txt_incharge);
            TextView txtqty = (TextView)itemView.findViewById(R.id.txt_qty);
        }
    }

    @Override
    public int getItemCount() {
        return listArray.size();
    }
}
}

activity_production_detail.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context="com.udayaj.sreeauto.ProductionDetail">

<android.support.v7.widget.RecyclerView
   android:layout_width="match_parent"
   android:layout_height="match_parent"
   android:id="@+id/recycle_view"
   />



 </LinearLayout>

row.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:id="@+id/linear1"
>

<TextView
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_marginStart="15dp"
    android:text="Date"
    android:textStyle="bold"
    android:textSize="20sp"
    android:id="@+id/txt_date" />

<TextView
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_marginStart="43dp"
    android:text="Shift"
    android:textSize="20sp"
    android:textStyle="bold"
    android:id="@+id/txt_shift" />

<TextView
    android:id="@+id/txt_incharge"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_marginStart="38dp"
    android:text="Incharge"
    android:textSize="20sp"
    android:textStyle="bold" />


<TextView
    android:id="@+id/txt_qty"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:text="Qty"
    android:layout_marginHorizontal="45dp"
    android:textSize="20sp"
    android:textStyle="bold" />



</LinearLayout>

Adapater.java

package com.udayaj.sreeauto;


public class Adapater extends RecyclerView.Adapter<Adapater.ImageViewHolder> 
{

private Context mContext;
private List<Datastore> mUpload;

public Adapater(Context context, List<Datastore> uploads) {
    mContext = context;
    mUpload = uploads;
}

@Override
public ImageViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
    View v = LayoutInflater.from(mContext).inflate(R.layout.row, parent, 
false);
    return new ImageViewHolder(v);
}

@Override
public void onBindViewHolder(ImageViewHolder holder, int position) {
    Datastore uploadCurrent = mUpload.get(position);
    holder.txt_date.setText(uploadCurrent.getDate());
    holder.txt_shift.setText(uploadCurrent.getShift());
    holder.txt_incharge.setText(uploadCurrent.getIncharge());
    holder.txt_qty.setText(uploadCurrent.getQty());

   }

 @Override
 public int getItemCount() {
    return mUpload.size();
 }

 public class ImageViewHolder extends RecyclerView.ViewHolder {
    TextView txt_date;
    TextView txt_shift;
    TextView txt_incharge;
    TextView txt_qty;

    public ImageViewHolder(View itemView) {
        super(itemView);

        txt_date = itemView.findViewById(R.id.txt_date);
        txt_shift = itemView.findViewById(R.id.txt_shift);
        txt_incharge = itemView.findViewById(R.id.txt_incharge);
        txt_qty = itemView.findViewById(R.id.txt_qty);
    }
   }
 }

Datastore.java

package com.udayaj.sreeauto;

public class Datastore {

private String Date;
private String Shift;
private String Qty;
private String Incharge;

public Datastore(){

}

public Datastore(String date,String shift, String qty, String incharge){
    Date = date;
    Shift = shift;
    Qty = qty;
    Incharge = incharge;
}

public String getDate() {
    return Date;
}

public void setDate(String date) {
    Date = date;
}

public String getShift() {
    return Shift;
}

public void setShift(String shift) {
    Shift = shift;
}

public String getQty() {
    return Qty;
}

public void setQty(String qty) {
    Qty = qty;
}

public String getIncharge() {
    return Incharge;
}

public void setIncharge(String incharge) {
    Incharge = incharge;
}
}

如何获取Android firebase子数据库

0 个答案: